5. INVESTMENT SECURITIES (Detail) - (Table 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Asset-Backed Securities, Securitized Loans and Receivables [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Investment securities not due at a single maturity date:
Investments securities not due at a single maturity date	$ 205,981
Investments securities not due at a single maturity date	1,900
Asset-Backed Securities, Securitized Loans and Receivables [Member] | Estimate Of Fair Value, Fair Value Disclosure [Member]
Investment securities not due at a single maturity date:
Investments securities not due at a single maturity date	210,807
Investments securities not due at a single maturity date	2,028
Delete Member | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Investment securities not due at a single maturity date:
Investments securities not due at a single maturity date	64
Delete Member | Estimate Of Fair Value, Fair Value Disclosure [Member]
Investment securities not due at a single maturity date:
Investments securities not due at a single maturity date	87
Total [ Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Investment securities not due at a single maturity date:
Investments securities not due at a single maturity date	235,171
Investments securities not due at a single maturity date	1,900
Total [ Member] | Estimate Of Fair Value, Fair Value Disclosure [Member]
Investment securities not due at a single maturity date:
Investments securities not due at a single maturity date	241,881
Investments securities not due at a single maturity date	2,028
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Within one year	1,010
After one year through five years	3,382
After five years through ten years	11,644
After ten years	13,090
Aggregate amount of available-for-sale debt securities at fair value with specific maturity dates.	29,126
Estimate Of Fair Value, Fair Value Disclosure [Member]
Within one year	1,016
After one year through five years	3,567
After five years through ten years	12,456
After ten years	13,948
Aggregate amount of available-for-sale debt securities at fair value with specific maturity dates.	$ 30,987